In Myth 14, The Lay of Thrym, it is Heimdall’s idea to Dress up Thor as a woman, in order to trick Thrym, the king of the frost giants, into thinking it was Freyja. The ploy works and Thor recovers his stolen hammer Mjollnir.
Heimdall was associated with the sea and was the son of nine maidens (9 waves??). In Myth 5 – The Song of Rig he calls himself Rig and travels across the land visiting several households, speaking honeyed words, winning over the woman of the household and creating the three races of men.
His acute senses make him an ideal watchman for the gods. His hall is Himinbjorg (Cliffs of Heaven) which stands near the rainbow Bifrost. He owns the horn Gjall which can be heard throughout the nine worlds.
He needs less sleep than a bird and can see a hundred leagues in front of him as well by night as by day. He can hear the grass growing on the earth and the wool on sheep, and everything that makes more noise – Snorri Sturluson